Tadeki Tani has written some excellent books and articles on emulsion science. They are at a very low level concerning the mechanisms and involve a lot of physical chemistry. They do NOT teach you how to make an emulsion. Bob Shanebrook's book is an excellent inside look at film making at Kodak but it does NOT teach you how to make the film, the emulsion, the dispersions for color, nor does it teach you how to make the coatings.
So, there are gaping holes in our knowledge.
One of the things that I pointed out in the GEH workshop was the fact that there are NO modern descriptions of emulsion making and NO existing book is free of blatant errors. I handed out examples and discussed the pitfalls in the existing literature. This means that you cannot duplicate almost all published formulas due to errors or omissions.